下面是报错的内容
Fatal error: Uncaught PDOException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'class_id' in 'where clause' in D:\PHP\xiaopi\phpstudy_pro\WWW\lyj.com\index.php:58 Stack trace: #0 D:\PHP\xiaopi\phpstudy_pro\WWW\lyj.com\index.php(58): PDOStatement->execute() #1 {main} thrown in D:\PHP\xiaopi\phpstudy_pro\WWW\lyj.com\index.php on line 58
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翻译一下，class_id有问题吧